摘要:
A multilevel modulation optical transceiver for distributing an OTN frame defined by ITU-T to a plurality of lanes for transmission, the multilevel modulation optical transceiver including: an MLD transmission unit; and a data replication unit, further including a data rearrangement unit arranged at a preceding stage of the MLD transmission unit, for performing data rearrangement processing of replicating, in advance, a frame synchronization pattern of an overhead of the OTN frame before being subjected to the lane rotation processing from a first lane that has the overhead to another lane that does not have the overhead, and of saving a payload to be overwritten with the frame synchronization pattern to a reserved area of the overhead to enable the payload to be restored on a reception side.
摘要:
A first differential encoding circuit is configured to perform a differential encoding on n-lines parallel input data to generate n-lines parallel output data. A second differential encoding circuit is configured to perform a differential encoding on n-lines parallel input data to generate n-lines parallel output data. A multiplexing circuit is configured to alternately multiplex the generated parallel output data from the first differential encoding circuit and the second differential encoding circuit, and configured to output the multiplexed data.
摘要:
In a digital signal processing optical transmission apparatus such as a predistortion or OFDM type one, optical transmission at a stable S/N ratio is intended to be able to be made by controlling an output of an optical transmission signal with fixed average power, even if a peak to average power ratio of the optical transmission signal changes. The apparatus is provided with an average power calculation unit (30) that calculates the average power of a digital signal outputted from a digital signal processing circuit (2), and an optical power variable unit (31) that serves to make constant the average power of an optical transmission signal outputted from an optical vector modulator (5).
摘要:
A parallel precoder circuit executes a differential encoding operation on an n-row parallel input information series, and outputs an n-row parallel output information series, where 2≦n. Output sets of differential encoding operation circuits each of which having a largest column number from among differential encoding operation circuits disposed in first row to (n−1)th row become first-row to (n−1)th-row parallel outputs information series, and an output set of an nth-row delay circuit becomes nth-row parallel output information series.
摘要:
A multistage canned motor pump comprising a pump section including a plurality of pump chambers and a motor section behind the pump section, both the sections having in common a single rotation shaft, and further a balance disk between the pump and motor sections, wherein an external circulation system is provided so that a part of a treating liquid discharged from a last stage pump chamber is circulated from a front rotor chamber through a pressure chamber accommodating the balance disk to a rear rotor chamber while the remaining part of the treating liquid is supplied to a rear bearing section for lubrication of the bearing section and further circulated through an external pipe to a pump section port for cooling of the motor section, and wherein an annular balance sheet is provided a verge at a high pressure side of the balance disk in the pressure chamber to control a flow rate of the treating liquid to thereby reduce a pressure of a circulation flow of the treating liquid toward the motor section.
摘要:
A first differential encoding circuit is configured to perform a differential encoding on n-lines parallel input data to generate n-lines parallel output data. A second differential encoding circuit is configured to perform a differential encoding on n-lines parallel input data to generate n-lines parallel output data. A multiplexing circuit is configured to alternately multiplex the generated parallel output data from the first differential encoding circuit and the second differential encoding circuit, and configured to output the multiplexed data.
摘要:
An optical transmitter for converting an input data series into an optical multi-level signal and for outputting the same, includes an LUT in which data for executing optical multi-level modulation is stored and from which first modulation data and second modulation data are output based on the input data series. A DAC converts the first modulation data by D/A conversion to generate a first multi-level signal. A DAC converts the second modulation data by D/A conversion to generate a second multi-level signal. A dual-electrode MZ modulator includes a first phase modulator for modulating light from a light source in accordance with the first multi-level signal and a second phase modulator for modulating light from the light source in accordance with the second multi-level signal, and combines an optical signal from the first phase modulator and an optical signal from the second phase modulator to output the optical multi-level signal.
摘要:
A parallel precoder circuit executes an EXOR operation on an n-row parallel input, and outputs an n-row parallel output, where 2≦n. Outputs of EXOR circuits each of which having a largest column number from among EXOR circuits disposed in first to (n−1)th rows become first-row to (n−1)th-row parallel outputs, respectively. A output of an nth-row delay circuit becomes an nth-row parallel output.
摘要:
The invention provides a pulsation free pump which includes a plurality of hydraulic diaphragm pumps, a plurality of plungers corresponding to the hydraulic diaphragm pumps, each of the plungers performing a reciprocal movement which provides a pumping cycle operation of corresponding one of the plurality of hydraulic diaphragm pumps and an adjustable exhaust differential pressure regulating valve. Each of the pumping cycles includes a discharge process and a subsequent suction process. A controller is provided for controlling reciprocal movements of the plungers in association with each other at a predetermined difference in phase of the pumping cycle. The controller controls the reciprocal movement of each of the plungers so as to set a preliminary pressure-rising process just before the discharge process so that a discharge flow rate of each of the diaphragm pumps is initiated to increase without any time delay when the pumping cycle enters into the discharge process so that a total discharge flow rate defined by the sum of the discharge flow rates of all of the plungers is kept constant and free of any substantial pulsation.
摘要:
An optical transmitter for converting an input data series into an optical multi-level signal and for outputting the same, includes an LUT in which data for executing optical multi-level modulation is stored and from which first modulation data and second modulation data are output based on the input data series. A DAC converts the first modulation data by D/A conversion to generate a first multi-level signal. A DAC converts the second modulation data by D/A conversion to generate a second multi-level signal. A dual-electrode MZ modulator includes a first phase modulator for modulating light from a light source in accordance with the first multi-level signal and a second phase modulator for modulating light from the light source in accordance with the second multi-level signal, and combines an optical signal from the first phase modulator and an optical signal from the second phase modulator to output the optical multi-level signal.